Chapter $7,$ Problem $10$

Assuming an allowance of $15$ percent of job time, what is the standard time for element $1$ based on the observations?

$0\mathrm{.}68$

$1\mathrm{.}09$

$1\mathrm{.}51$

N

one of above

$5$ points

QUESTION $7$

Chapter $7,$ Problem $10$

Assuming an allowance of $15$ percent of job time, what is the standard time for element $2$ based on the observations? $($Please keep $3$ digits after the decimal point.$)$

$5$ points

QUESTION $8$

The data in the following table represent time study observations for a woodworking operation.

a$.$ Based on the observations, determine the standard time for the operation, assuming an allow$-$

ance of $15$ percent of job time.

b$.$ How many observations would be needed to estimate the mean time for element $2$ within

$1$ percent of its true value with a $95\mathrm{.}5$ percent confidence?

c$.$ How many observations would be needed to estimate the mean time for element $2$ within

$\mathrm{.}01$ minute of its true value with a $95\mathrm{.}5$ percent confidence?

OBSERVATIONS $($minutes per cycle$)$

Element

Performance

Rating $123456$

$1110\%1\mathrm{.}201\mathrm{.}171\mathrm{.}161\mathrm{.}221\mathrm{.}241\mathrm{.}15$

$21150\mathrm{.}830\mathrm{.}870\mathrm{.}780\mathrm{.}820\mathrm{.}851\mathrm{.}32*$

$31050\mathrm{.}580\mathrm{.}530\mathrm{.}520\mathrm{.}590\mathrm{.}600\mathrm{.}54$

Chapter $7,$ Problem $10$

Assuming an allowance of $15$ percent of job time, what is the standard time for the whole operation based on the observations? $($Please keep $2$ digits after the decimal point.$)$